USGS Water-Year Summary 2023

362718089552301 Gideon

Mississippi embayment aquifer system
McNairy Formation

LOCATION - Lat 36°27'18.4", long 89°55'22.9" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 SE 1/4 sec.13, T.21 N., R.10 E., New Madrid County, MO, Hydrologic Unit 08020204,

REVISIONS HISTORY - Revisions: Land-surface datum was updated to 270.00 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 272 ft NGVD29 from topographic map. Discrete water-level measurements prior to May 22, 2023, are referenced to the original datum.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 270 ft above North American Vertical Datum of 1988. Measuring point: DNR DCP platform shelf, 2.5 ft above land-surface datum, Aug. 21, 1962 to present.  

PERIOD OF RECORD - February 4, 2009 to present.

GAGE - From February 04, 2009 to present, DCP with telemetry capability as water level recording device and a vented, submersible pressure transducer as water level measuring device. These devices are setting in a metal gage house next to a turbine pump which sets over the well.

COOPERATION - From February 04, 2009 to present, water level data furnished by Missouri Department of Natural Resources (MDNR) and data processed by USGS and MDNR.

REMARKS - Data from February 04, 2009 to September 07, 2010 is good based on 6 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.1 ft. The record from 09/08/2010 to 07/11/2011 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 07/11/2011 to 09/11/2012 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 09/11/2012 to 08/19/2013 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 08/20/2013 to 08/11/2014 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. MDNR and USGS are using different MP points to measure WL's. Need to clearly mark the MP so future WL's are in agreement with each agency. The record from 08/12/2014 to 03/09/2016 is good based on 6 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. Incorrect application of tape corrections during this period have decreased the accuracy of the record from +/- 0.05 ft to +/- 0.10 ft. The record from 08/12/2014 to 06/08/2016 is good based on 6 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. Incorrect application of tape corrections and possible excessive instrument drift during this period contributed to a decrease in the accuracy of the record from +/- 0.05 ft to +/- 0.10 ft. The record from 06/09/2016 to 02/28/2017 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. Incorrect application of tape corrections and possible excessive instrument drift during this period contributed to a decrease in the accuracy. The record from 03/01/2017 to 09/05/2017 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. Incorrect application of tape corrections and possible excessive instrument drift during this period contributed to a decrease in the accuracy. The record from 09/06/2017 to 04/10/2018 is good based on 2 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. Incorrect application of tape corrections and possible excessive instrument drift during this period contributed to a decrease in the accuracy. The record from 04/11/2018 to 12/10/2018 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 12/11/2018 to 04/16/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 04/17/2019 to 05/20/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 05/21/2019 to 10/01/2019 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.20 ft. 

All later correction notes and remarks can be found in RMS as of 10/02/2019.